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Sol Badguy (ソル バッドガイ, Soru Baddogai) is the main protagonist of the Guilty Gear series and Ky Kiske's eternal rival. At first glance, he is an aloof, anti-hero bounty hunter, whose apparent laziness and gruffness belies his terrifying fighting ability, amazing intelligence and emotional depths beneath that brash exterior.

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Creator Daisuke Ishiwatari designed Sol in many ways to reflect his alter-ego, and also recorded Sol's in-game voice acting (the voice acting for GGXX's Story Mode and Drama CDs however, is done by Hikaru Hanada).

Sol's normal character design depicts him with brown hair and reddish-brown or golden eyes with slit pupils (the latter of which is to distinguish his true nature as a Gear), wearing a tight, black undershirt with the top half covered by a red, sleeveless jacket along and white jeans. His headband bears the words 'Rock You', while his belt buckle has the word 'FREE'. Sol's character design also contains a pair of black, fingerless gloves, red shoes, a drape of red cloth hanging down beneath his buckle and a multitude of belts, including a lone one on his left bicep. Sol fights using a blunt, rectangular sword known as Fuuenken (Fireseal) through which he releases a range of fire-based attacks.

Of note is that Sol is officially left-handed. In recent official artwork, Sol, as Frederick, was depicted with blue eyes and sported shorter hair.

Sullen and unrefined, Sol only speaks to others when absolutely necessary. This is reflected in everything he does, and his fighting moves, while rough and unpolished, are executed with absolute precision. He is known to be rude and impatient towards those who wish to interact with him, whether they are friend or foe. He is also quite stubborn when he is in pursuit of a goal or when he decides to take action regarding certain matters, never allowing the opinions of others to dissuade him once he's made up his mind. Overall, Sol is not a friendly man, but he is not an inherently evil one neither. He is an individual who prefers to convey his intent through actions than words. And while he cynically mocks those who speak of "justice", he has demonstrated a staunch sense of righteousness that motivates him to prevent anything that may potentially threaten the world and the peace that's been established after the horror of the Crusades.

He is also known to be a very lazy and half-hearted individual, despite most of his prior accomplishments, as well as him often holding back his power all due to not being bothered with the idea of full effort, which is something Ky often notices in much of his prior rivalry dialogue with Sol.

His actions have also proven that he is quite compassionate in contrast to his anti-social persona. He refused to harm neither Dizzy nor Solaria due to their innocence and kindness, despite the fact that they are Command-Type Gears who possess enormous power that puts them on equal footing with Justice and the ability to subjugate Gears to their whim; he even gave a Gear-Cell limiter to Solaria so she can control her power and rescued Dizzy when she was possessed by Necro and went on a rampage. He also spared Testament on several occasions despite being a dangerous and powerful Gear due to him being the son of his friend and mentor, Kliff, as well as out of mutual sympathy since they are both humans who were forcibly converted into Gears. He also takes in Sin at the behest of Ky and Dizzy so that he would not be placed in danger by the Conclave. He even offered a prayer for Justice's soul to find peace in the afterlife after he defeated her for the second time. He also swears to save Elphelt from her fate as a tool of the Universal Will. It is seen through the course of the series that Sol has much deeper emotional depths than he normally doesn't display towards people.

Pre-Overture Sol constantly roamed the world alone, and kept everyone at a distance, only stopping to fight when it was necessary or to intervene in cataclysmic events. His aloofness and cynical attitude was developed as a result of his betrayal by his once best friend and colleague, Asuka R. Kreutz (known throughout the series as That Man) through the death of his love, Aria and transformation into a Gear. Since then, Sol maintains his aloofness and cynicism throughout the series, primarily to avoid hurting anyone due to his nature as a Gear. As the series progresses however, his clashes with many of the series characters slowly begin to change his outlook, especially his rival Ky Kiske and Ky's son Sin, who he reluctantly takes as his apprentice. During the final battle against St. Maximus Populi Ariels in Guilty Gear Xrd -Revelator- Sol admits to her that the world where he kept himself distant to others, was worth saving, and finally acknowledged that despite what he was and his fear of the future, he was no longer alone in the world.

As shown before arriving to the final battle against Ariels, Sol also expresses a nervous attitude when his theoretical connection with Dizzy and Justice is being discussed, making him feel embarrassed from listening to this while continuously disconfirming himself from being mistaken as Dizzy’s “father” which would make him Ky’s “father in-law” and Sin’s “grandfather”.

His exact history is unclear, but it is known for certain that Sol's real name is Frederick Bulsara. Originally, he was a scientist who majored in Magic Particle Physics and was previously working on a project known as Saint Oratorio before he joined the core team of the Gear Project. He was not only one of the lead scientists of the Gear Project, but is also the Prototype Gear from over a hundred years before the events of the Guilty Gear games. In 2016, after he received the devastating news of Aria's illness, he is betrayed by his colleague and close friend, Asuka R.Kreutz, who forcibly has him converted into the first Prototype Gear. Somehow, he managed to escape the lab and tried to discover a means to return him to his human form, leading him to creating his trademark headband. His headband is actually a Gear-suppression device which prevents him from giving into his Gear nature and losing his rationality, at the cost of suppressing much of his power. The headband also conceals the red brand on his forehead, the telltale mark that would expose him as a Gear. As a prototype, he is immune to the orders of Commander-Type Gears. He was personally acquainted with That Man prior to the Crusades. In Guilty Gear 2: Overture, this headband suppression device seems to be beginning to malfunction, explaining the increase in Sol's strength. That Man later explains the malfunction and Sol's increase in power is due to his body and powers evolving.

After he had constructed the limiter Headguard to maintain his human form, he made it his personal mission to destroy all Gears so that they could not be used for war. He destroyed several Gear Plants, which would eventually earn him the designation "Badguy" as authorities could not identify him. When he caught news of the completion of Justice, He created the "Outrage" in response, which he called a supreme Anti-Gear weapon. The Outrage is actually not one weapon but several - eight components called "Jinki" (Sacred Treasures), which greatly amplify their wielders' magical ability. The reason the Outrage was split into the eight Sacred Treasures is because the power of the complete Outrage was far too cumbersome for Frederick to control as it had no predetermined limits to how much Mana it could generate, and could potentially destroy the world if its power was not properly regulated. Only four Outrage weapons are currently known to be active - Sol's own Fuuenken (Fireseal) that he combined with Senga (The Flashing Tooth) to create the Junkyard Dog MK.3, Ky's Fuuraiken (Thunderseal), and Anji Mito's twin fans, Zessen (Unparalleled Fans). The other three are supposedly in the custody of the United Nations, and Slayer is also in possession of an unknown Sacred Treasure.

Frederick also saved Kliff Undersn (one of the leaders of the Holy Order and the one who named Ky Kiske leader of the Holy Knights) when Kliff was still a young boy. He would later encounter the Nightwalker, Slayer, who would bestow upon him the name "Sol" and would act as a mentor of sorts. Roughly half a century later, he was himself recruited into the Order, as a bounty hunter named "Sol Badguy". Sol took part in the Crusades, ironically becoming one of the best fighters on the human side. At this time, he was a member of the Sacred Order of Holy Knights (Seikishidan). He acquired the nickname "Corrupted [or Immoral] Flame" (Haitoku no Honoo) during that time, a name that such figures as I-No and Justice use for him later. However, he later became disenchanted with the methods of the Sacred Order. At an unspecified time, Sol fled the order, taking with him the Fuuenken, which the Holy Knights had come to consider a sacred treasure — the theft earned him Ky Kiske's enmity. Ironically, Sol himself forged the Fuuenken.

In 2175, Sol faced Justice directly. The two fought, and Justice won, also discovering that Sol was a Gear (but not his true identity as the Prototype Gear). Justice attempted to assert her power as a Commander Gear to control Sol, but was unable to do so. Exploiting her confusion from the fight, the Holy Order, led by Ky Kiske, sealed Justice away, bringing the war to an end.

Canon states that Sol was the winner of the Tournament, and it is here that Justice discovers that Sol is, in fact, Frederick. Justice, in her dying words, comments that she wishes that "the three of us" could talk one last time, and Sol swears to kill That Man.

Sol has three endings, all of which involve a fight against Dizzy, who has a half-million World Dollar bounty on her head. However, he spares her life in all of them, losing against her in his second ending, and judging that she isn't a threat to the world in the other two. In his third ending, we see a conversation between That Man and one of his servants, in which That Man cryptically says "To think there was a daughter... most interesting". It is revealed in the Drama CD Side Black to that this a reference to Justice being Dizzy's mother.

His storyline here involves chasing down I-No. His first ending, after he defeats I-No, leads to a direct confrontation with That Man. That Man casually deflects all Sol's attacks, and says that Sol is needed because soon a greater battle than the Crusades will occur. In Sol's second ending, Slayer informs him of the Post-War Administration Bureau's interest in Dizzy, which catches his interest. In the third, he fights Dizzy, who had been possessed by Necro after I-No knocked her off the Mayship, and sends Dizzy on her way to meet Johnny and May.

His story here follows directly after the previous one in that he is hunting I-No down, as well as investigating the Post-War Administration Bureau. Depending on the player's choices and actions, Sol may do battle with Ky, and upon further investigation, encounter Crow and defeat his copy of Justice, before encountering I-No again and being pulled into the past and being forced to battle his past self, Order-Sol.

After their battle, I-No slyly kills Order-Sol. Depending on the players choices and/or if they did not use a continue at all, Sol will either be destroyed by the resultant time paradox as That Man laments Sol's falling for I-No's trickery and implores him to live (Path 2), or he will resist it and obliterate I-No, before returning to the present and battling Ky (for the second time if players choose the first option upon encountering him at the P.W.A.B. branch). After the battle, Ky makes Sol promise that they'll meet again before they go their seperate ways (Path 1).

Sol Badguy has taken in a young man named Sin as his apprentice, and travels the world with him as bounty hunters. During their journey, they came across a wanted poster with Sol’s picture on it. Sol figures that the poster is just Ky's way of asking for help. Shortly after, he is plagued by a headache and the pair are attacked by the Vizuel, the servants of Valentine. The Vizuel had the upper hand until a voice introduces Sol to a new power, the Soul Sinker. This allowed Sol to construct Servants of his own from his soul, leading to their victory. The voice later introduced himself as Izuna, a resident of the Backyard. Izuna told Sin and Sol that the Vizuel were seeking out and destroying Gears. Their main area of interest was the kingdom of Illyria.

Izuna, through a series of warp gates, takes the pair to Illyria. There, they meet Valentine for the first time. Sol’s head ached again, and he was shocked by Valentine's resemblance to Aria. Sol battled her and the Vizuel with the help of Izuna’s powers. After the fight, the group made it to Illyria Castle, where they found Ky in a powerful binding spell. They met with Raven, who Sol recognized as That Man's servant, and the two battle.

After the fight, Sol left Sin to guard Ky, while he went to meet Dr. Paradigm who can release Ky's spell. Sol was shocked to be brought to a colony of living and self-aware Gears. After learning that Sol is Frederick, Dr. Paradigm agreed to help the king. Sol then accompanied Dr. Paradigm to Illyria to release the seal placed on Ky. After realizing that Sin carries the Gear cells Valentine needed, Sol and Izuna left the others to defend Illyria Castle while they chased after the young man.

They were too late to stop Valentine from kidnapping Sin. Sol and Izuna chased after them to Bel Canto Valley where they fought a brainwashed Sin. After Sin came to his senses, the group took off after Valentine. Thousands of Vizuel stood in their way. To their surprise, Ky, Paradigm, and the knights of Illyria arrived to take on the fight. Sol, Izuna, and Dr. Paradigm went on ahead, leaving Sin and Ky to take on the Vizuel.

Sol and the others reached the gate to the Backyard, but it was already closed. Just before all hope was lost the gate opened and a lone figure came out, That Man. Sol unleashed his evolved Dragon Install in order to fight That Man. During the battle, That Man seemed to be testing Sol, and informed him about Valentine's intentions. When the battle ended, Sol was unable to damage That Man. As he left, That Man gave the group an effect that would enable them to survive the immense pressure of The Backyard.

The group entered the Backyard and caught up to Valentine. The Key was already in motion and the Cube was starting to open. In frustration, Valentine transformed into a Justice-like monster and battled the late arriving Sin together with Izuna and Dr. Paradigm. Meanwhile, Sol was busy stopping the Cube from opening. He succeed, and Valentine seemed to give up fighting. She appeared as if she was going to self-destruct. Sol told the others to escape the Backyard while he remained back to fight yet another form of Valentine. In the fight, Sol battled both Valentine's immense body and her soul. In her soul, he would hear a rush of her emotions and memories. Once he laid the final blow, the last thing she said was his true name, Frederick. After the fight, Sol found himself in a white space, unable to return.

While there, That Man came before him yet again. He revealed that Valentine is involved with “A Merciless Apocalypse”, an event that Sol is to take part in. Sol confirmed with That Man that Valentine was a copy of Aria, Sol’s former lover, who is implied to be the woman That Man turned into Justice. With That Man's help, Sol was able to return to the real world and reunite with the others.

Sol has been traveling with Sin when he heard Ramlethal Valentine's declaration of war on humanity. After a brief talk with Ky, he decides to fight her, wanting 1 million World Dollars of bounty in return. Ky and Sol meet in Neo New York, where they fight before heading out to Japan to confront Ramlethal. After fighting and beating her, the entire declaration of war turned out to be a trap to lure Sol out. After people of Babylon are obliterated by the giant explosion, Ramlethal grabs Sol, intending to self-destruct, killing him with her. However thanks to Elphelt on disabling Ramlethal's self-destruct and rendered her powerless, Sol able to subdue her. When he's about to kill Ramlethal, Ky suggest to keep her alive and taking her into custody to find out who sent her. During Elphelt's introduction, Sol despise her and believe that she may betray humanity in the end. While Sin and Elphelt integrate Ramlethal to develop her emotions, Sol patrol outisde the room where the three plays there.

Sol Badguy is often noted to be one of the most powerful fighters seen in the Guilty Gear series. Being the Prototype Gear, Sol was immune to the control Justice had over other Gears. Due to his Gear state, he possesses longevity, degrees of regeneration and in some cases, invulnerability. While he does not practice any fighting style in particular, his skill level seems to be second to none. He is also a master swordsman and doesn't appear to favor any particular type of blade, no matter the size.

His fighting style is well-known for being self-taught, without much form with a huge focus on all-out brawling, and also being noted for his left-handed reverse grip. However, throughout several years, Sol has refined his fighting style into a more personal form that also involves solid control over his flames. Attacks involved in this style are often crude in nature, such as headbutts, wide-swinging strikes, slams, fierce punches and kicks all due to his lazy nature. Sol's fighting style prioritizes precision and practical application of his strength above elegance.

Sol is stated to be a genius practitioner of Magic Arts outside of his natural flame magic. This is evidenced by his creation of the Sacred Treasures, each being a powerful magical amplification device imbued with a different element based on the Five Element Configuration and possesses unique qualities.

Sol's weapon of choice is the Fireseal (Fuuenken), a uniquely designed sword with a rectangular blade, the blunt part which seems to have an exhaust/engine-like device that spews forth flames. The weapon itself is capable of generating high-power flames, which he can use to augment both his physical and sword attacks. He often fashions this fire into ground-bound projectiles. He later upgrades to the Junkyard Dog MK III in Guilty Gear Vast Edge and -SIGN- , which is actually a combination of two Outrage weapons - The Fireseal and the Flashing Tooth. Sol designed Junkyard Dog MK III with a secondary function to transfigure into a long-range cannon that can fire magical bullets packed with his own flame magic as well as unleash an extremely powerful Magic Art called Saint Oratorio, which can release intense bursts of magical energy. However, the backlash from unleashing this spell is tremendous, causing it to not only cause significant damage to the target and environment, but the user as well, which is why Sol utilizes it sparingly.

Additionally, thanks to Izuna's modifications to his magic during the Baptisma 17 incident, he has also tapped into the ability to use the Soul Sinker system, a powerful and almost obscure summoning ritual that allows him to manifest his soul (also known as a Master Ghost) into physical reality and create Servants, powerful familiars born from his soul. Though, due to his relative inexperience with this magic and risks involved in manifesting his Masterghost (which would result in the obliteration of his soul should it be destroyed), he does not use it often. He has made use of the matter displacement aspect of this spell to create materials that he can use to construct his weapons and even a new vehicle, the Fire-Wheel MK II, which he named after his Servant.

Whenever Sol becomes serious or desperate, he may rely on his own latent Gear powers to give him an extraordinary boost. Whenever he first does so, his body flashes a silhouette, as if to contain an inner beast. In truth, this is him holding back his transformation. When he was a bit younger as a Holy Knight, the silhouette has wings and a long tail, which suggests that in his current state, he has been able to repress it almost entirely. However, due to the encroachment of his Dragon Install caused by the Flame of Corruption, he will transform into a dragon-like creature with his blade wrapped in infernal flames shaped into a sword when properly provoked, allowing him to go toe-to-toe with That Man.

However, it had been stated that even in this form during the fight, Sol had not actually went all out, nor did he remove the Gear-Cell limiter on his head, which may suggest an even more drastic transformation should he release all of his power. He has since learned to repress his Dragon Install into more humanoid forms as seen in Vastedge and Xrd.

Ishiwatari's favorite band is Queen, and he thus named Sol Badguy, whose real name is Frederick Bulsara (or Freddie for short), after Freddie Mercury, whose nickname was 'Mr. Bad Guy'. Sol's true last name is also based off of Freddie Mercury's birth name, Farrokh Bulsara, before he had it legally changed.

Like Ishiwatari, Sol's favorite band is also said to be Queen, with Sol's favorite album being 'Sheer Heart Attack'. The special item that Johnny steals from Sol with his Treasure Hunt Overdrive is a vinyl LP with a butterfly motif on the label, very similar that found on 'Sheer Heart Attack'.

Sol's theme song, "Keep Yourself Alive", shares the same name as the first track from Queen's debut album. Several chords are lifted from another Queen song, "Stone Cold Crazy".

Sol's Instant Kill, "Napalm Death", shares its name with that of a Grindcore/Death metal band.

Fafnir, written as Fáfnir or Frænir is known as a son of the dwarf king Hreidmar of Norse mythology, and through Andvari's ring and gold curse, Fafnir was transformed into a dragon and slain later by Sigurd.

As noted above, Sol's headband bears the words 'Rock You', a reference to the Queen song "We Will Rock You".

The "FREE" inscription on Sol's belt buckle may be a double reference— one being to Queen's "I Want to Break Free" and the other being to a lyric in English metal band Iron Maiden's song "Revelations":

Bind all of us togetherAblaze with hope and free,No storm or heavy weatherWill rock the boat you'll see.

Sol appears as a guest character in Square Enix's game, Lord of Vermilion III.

Sol is a playable character in the IO Entertainment Online Fighting Game, Lost Saga.

Official art and Guilty Gear Xrd -SIGN- confirms that Sol enjoys smoking. Additionally, he can arguably be heard lighting a cigarette in the Guilty Gear X Drama CD.

Sol's clothing brand of choice has always been "RIOT". Sin and Bridget also use the same brand. According to text in artwork, RIOT was established in 2134.

Sol's favorite brand of alcohol is gin.

In the Guilty Gear Xtra manga, Sol is shown to have a secret hideout located in the ruins of Old New York; this hideout has a laboratory with a global mapping system. He also keeps a picture showing him, his former lover Aria, and That Man (whose face has been intentionally damaged). This is faintly alluded to in Elphelt's Win Quote against him when she suggests that Sol would always carry a picture of her if they were a couple.

It is revealed in the Library Database of Guilty Gear Xrd that Sol is not the only Prototype Type Gear. After his escape, the US government and Asuka R.Kreutz had created several more Prototypes before the eventual creation of Justice. What happened to these prototypes is unknown.

Sol, Axl Low, I-No, and Johnny, are the only characters in the series that can play the guitar.

One of Sol's shouts during battle is "Gun Flame", which is the name of one of his special moves. Because of the lack of English dub and translation, however, players always mishear this as "girlfriend" and has since reached memetic stats.

On the front of Sol's Tyrant Rave ver. α, the exact same "eye" symbol that is on Venom's hair can be seen.

It has been shown in character art, short stories and cutscenes in Guilty Gear: Overture, Vastedge XT and - SIGN - that Sol regularly carries around Fire Seal/Junkyard Dog in a red duffel bag that he purchased from RIOT.

It is revealed in Guilty Gear Xrd that Frederick gained the name "Sol" from Eripmavs D Yraid (which is an anagram for Vampire's D Diary, which implies that Slayer may have given him his name), whereas he would later be designated as "Badguy" by the authorities, who are unable to identify him after destroying several Gear manufacturing facilities. He would later combine these names to create his new alias after becoming a Bounty Hunter.

Sol has created and wielded several blades(one of which looks almost identical to his Fireseal Sword save for the hilt) aside from the Fireseal Sword, including an axe and scythe. He also created a portable phonograph so that he can listen to Queen albums.

While he is officially left-handed, Sol has been seen in dual-wielding his Fireseal Sword and his hand-made weapons in official illustrations, which suggest that he can use his right hand to wield a sword with a level of proficiency, albeit not to same degree as his left hand.

In Xrd's Story Mode, Sol is later seen donning a jacket much like the one he wore in Vastedge. This jacket also materializes whenever he enters Dragon Install. He also wore a similar black-schemed jacket in the novel, Guilty Gear: Lightning the Argent, but gave it to Solaria to keep her warm.

In the popular internet series DEATH BATTLE created by ScrewAttack, Sol Badguy would go on to fight his "spiritual successor," Ragna the Bloodedge, the main protagonist from Arc System Works' other fighting game series BlazBlue. Sol would win the fight.

Sol's name and Fire based powers are likely a direct reference to the Norse Goddess of the Sun, who is also named Sol.

Sol appears alongside his eternal rival, Ky Kiske, Jam Kuradoberi and Ramlethal Valentine in the mobile game Seven Knights. In his default, Sol wears his primary outfit in Xrd -SIGN- but in different shades of red and his shoes are white as his Fireseal Sword resembles Squall's Revolver in Final Fantasy VIII, upon reaching five stars, Sol appearance and outfit are black and white to resemble his Gear form via Dragon Install and finally reaching a maximum of six stars, Sol's main appearance and his default outfit are reverted back to original colors.

Interestingly, Sol's default outfit is a contrast to Ky's six stars outfit making their signature colors are inverted in different shades.

Sol, along with both Ky and Jam (with Bridget as well) were playable in the Japanese MOBA, Chaos Heroes Online.

Sol makes an appearance in the mobile game Brave Frontier alongside Ky, Elphelt, Dizzy, Millia, Jack-O, and Ramlethal as part of a collaboration. He and Ky are both available as free collaboration units in the Neo New York and Royal Court dungeons, where players have a small chance of capturing the both of them. Sol appears as a fire unit, and the two of them are capturable as Omni-units, the highest rarity in the game. His theme, Give me a break, is used as his boss theme when fighting him.

Sol's weapon, the Junkyard Dog, is also available as a reward for the game's summoner arc. The weapon can be earned in Summoner mode in the Neo New York Again dungeon in the Summoner Arts research lab. The weapon has a level of 60 and when equipped, gives the players avatar Sols appearance as well. Players can also alter the costume colors depending on the element of their choosing.

According to the weapon's lore, the weapon that the player receives is actually a copy that Sol merely created from parts on a whim. Despite it being a copy, it is just as powerful without being surpassed by most weapons.